Abstract: The invention provides a prosthesis structure for anchorage to the joint end of an articulatory part of a joint in a human or animal body which comprises an engagement element which presents a flat or a substantially flat engagement surface for engaging with a complementary joint end surface provided at the joint end and an elongate fixture connected to and spaced from the engagement surface for insertion into a complementary bore provided at the joint end at a distance from the joint end surface. The invention further provides that the elongate fixture forms an acute angle with the engagement surface.

Abstract: The invention provides a prosthesis structure for anchorage to the joint end of an articulatory part of a joint in a human or animal body which comprises an engagement element which presents a flat or a substantially flat engagement surface for engaging with a complementary joint end surface provided at the joint end and an elongate fixture connected to and spaced from the engagement surface for insertion into a complementary bore provided at the joint end at a distance from the joint end surface. The invention further provides that the elongate fixture forms an acute angle with the engagement surface.

Abstract: The invention relates to a fixture for insertion into and permanent anchorage in a cavity (32) formed in bone tissue. The fixture is made of a fixture member (2), which has an insertion end surface (10) and a cylindrical peripheral surface (6) provided with screw threads, and a plurality of circumferentially-spaced cutting recesses (9), which are formed in a forward, self-tapping end portion (7) of the threaded peripheral surface (6) adjacent to the insertion end surface (10) and which open axially into the insertion end surface (10). A plurality of circumferentially-spaced tissue-collecting and tissue-distributing grooves (17) are formed in a rear, non-self-tapping portion (8) of the threaded peripheral surface (6).

Abstract: The invention relates to a cutting guide instrument and method for enabling high-precision resection of the head (caput femoris) (8) of the neck (5) of a human femur (collum femoris) at a predetermined cutting angle (&agr;c) to the femoral shaft (9) and on a predetermined cutting level (Lc) with respect to the proximal end of the caput (8). A support part (11) is fixed to the femur during the resection. A longitudinal guide carrier (12) is supported by the support part (11) and is aligned along the femoral collum (5) at said predetermined cutting angle (&agr;c) to the femoral shaft (9). A cutting guide (13) is supported by and movable along the axis (D—D) of the guide carrier (12) to a cutting position corresponding to the predetermined cutting level (Lc). The invention also relates to the use of the instrument for performing such resection.

Abstract: A prosthesis structure (1) for anchorage to the joint end of an articulatory part of a joint (11) in a human or animal body comprises an engagement element (3) which presents a flat or substantially flat engagement surface (3b) for engaging with a complementary joint end surface (14) provided at the joint end and an elongate fixture (4) connected to and spaced from the engagement surface for insertion into a complementary bore (12) provided at the joint end at a distance from the joint end surface (14). The elongate fixture forms an acute angle (&bgr;) with the engagement surface (3b).

Abstract: The invention is directed to a reamer for shaping a bone socket such as an acetabular cavity. The reamer comprises a cutting head for removing material from the socket during rotation of the cutting head. The cutting head comprises a number of relatively long main cutting edges, each of which extends in a direction from a base to a top of the reamer, and a number, higher than the number of main cutting edges, of relatively short peripheral cutting edges, which are located at the base and distributed at angulary spaced intervals about a rotational axis. The invention also provides a method for implanting a prosthesis component into a bone socket. During shaping of the bone socket, a top portion of the reamer is completely received in the bone socket to such an extent, that a cylindrical entrance portion is formed in the socket. The invention also provides a kit including a reamer and a prosthesis.

Abstract: The invention relates to a cutting guide instrument and method for enabling high-precision resection of the head (caput femoris) (8) of the neck (5) of a human femur (collum femoris) at a predetermined cutting angle (.alpha..sub.c) to the femoral shaft (9) and on a predetermined cutting level (L.sub.c) with respect to the proximal end of the caput (8). A support part (11) is fixed to the femur during the resection. A longitudinal guide carrier (12) is supported by the support part (11) and is aligned along the femoral collum (5) at said predetermined cutting angle (.alpha..sub.c) to the femoral shaft (9). A cutting guide (13) is supported by and movable along the axis (D--D) of the guide carrier (12) to a cutting position corresponding to the predetermined cutting level (L.sub.c). The invention also relates to the use of the instrument for performing such resection.

Abstract: The present invention relates to a cup-shaped member for a hip joint prosthesis for implantation into a cavity in the bone tissue in the acetabulum, and more particularly to an acetabular cup-liner assembly, in which the acetabular cup has an outer surface intended to face the bone tissue in the acetabulum and an inner surface intended to face a liner. The liner has an outer surface intended to face the inner surface of the cup, and the cup is provided with an opening adapted to receive the liner. At least the parts of the liner corresponding to the parallel inside walls of the cup have dimensions equal to or a fraction less than the inner dimensions of the sidewalls. The parts of the surfaces of the inner side walls of the cup located adjacent to the opening of the cup are essentially parallel to each other. The surface of at least the parallel inner side walls of the cup is provided with a grooved region. The liner has an outer shape that is complementary to the inner shape of the cup.

Abstract: Hip joint prostheses are disclosed for permanent anchoring in the human hip joint of a ball unit in the neck of a human femur. The prosthesis include a first cylindrical fixture portion for extending from the collum femoris toward the outer side of the femur and a second cylindrical fixture portion for placement in the cancellus bone of the collum femoris, both of these portions including outer cylindrical surfaces with external self-tapping threads, and in which the first and second cylindrical fixture portions are joined into a single portion for insertion into a bore hole provided in the femur in a single operation.

Abstract: The invention relates to a drill guide instrument and method for guiding a drill tool (24) when drilling a longitudinal bore (4) through the neck (collum femoris) (5) of a human femur (9), subsequent to resection of the head (caput) (8) of the collum (5) along a cutting plane (P). The instrument comprises a drill guide (20), which is provided with a base member (21) and arranged to guide the drill tool (24) along a drill axis (B--B) relative to the base member (21), said base member (21) being intended to be applied against a cut end surface (11) of the collum (5) defining the cutting plane (P) for obtaining a predetermined orientation of the drill axis (B--B) relative to the cutting plane (P).

Abstract: A hip joint prosthesis to be permanently anchored in a patient's hip is disclosed. The prosthesis comprises an attachment part for a ball unit designed to be anchored in the neck of a human femur. The attachment part comprises a primary fixture which may be an elongate anchoring element which is intended to be inserted into a channel extending through the femoral collum. The prosthesis also includes a secondary fixture for carrying a ball intended to be attached to the collum after removal of the head of the collum. The primary fixture and the secondary fixture are connected to each other. The prosthesis is preferably designed so that the length of the primary fixture terminates close to the head of the collum. The secondary fixture preferably comprises a plug-like part which is intended to be inserted in a cylindrical countersunk recess that is cut into the cancellous bone of the collum and which extends to the cortical bone in at least three locations.

Abstract: The invention relates to a hip joint prosthesis comprising an attachment part for a ball unit (18) being designed to be anchored in the neck of a human femur (collum femoris), said attachment part, which is intended to be inserted into a channel (5, 14) extending through the femoral collum, being provided with parts for carrying a ball or caput (18) intended to be attached to the collum after removal of the head of the collum. The attachment part also comprises a fixture part comprising two main parts, a first part (1) which is to extend through a bore-hole (5) from the collum femoris towards the outer side of the femur and a second part (2) intended to fit into a cylindrical cavity cut into the cancellous bone of the collum.

Abstract: The invention relates to a cup-shaped member for a hip joint prosthesis, for implantation into a cavity in the bone tissue in the acetabulum, comprising an acetabular cup (1) made of metal a ceramic material or any other suitable material, preferably of titanium, the outside of said cup being rotationally symmetrical around a central axis of symmetry. The outer side of the cup (1), that is the side which is to face the bone tissue, is provided with at least one circumferential bead (5) close to the edge of the cup (1), said bead (5) having a barb-like shape in section and consequently allowing the cup (1) to be pushed into said cavity but counter-acting the removal of said cup (1) from said cavity, said outer side including said bead(s) (5) being provided with a rough structure serving as a file when said cup (1) is moved or rotated in said cavity.